Stock and die



,May 27, 1 930. w, JONES 1,760,502

STOCK AND DIE Filed June 22, 1929 anomtoz will be coincidentwith theaxis of the head or stock.

Patented. Ma

ATES are r Fries ou s marches, on NEW roan, a. Assmnon or ONE-HALE moFRANCIS J. can- NELLI, or JAMAICA, new YORK STOCK AND DIE 7 cylinder,and particularly :lor cutting the threads on pipes of various sizes;wherein a ahead or stock is-provided with means for carrying a circularseries ofcuttersor jaws that are radially. arranged to secure with.their innerendsat about the same distance from the axisof the stock orhead at the bore dot the head, whereby on presenting a pipe at this boreand jturningthe head at the same time causing a relative movement toadvance the pipe'end into the bore to engage the jaws, ascrew threadwill be formed on the pipe.

In such devices in use at present, Where a pipe is presented that doesnot have the end regular andextending in. a plane perpendicular to theaxis of the pipe the thread is likely to be out irregular as the head inturning has a tend encv to cant or shift out 01"" the perpendicularplane, and the thread will not be symmetrical, and will not lit thenipple or connection into which the pipe is screwed, in the propermanner.

The object of the present invention is to provide the several cutters ormembers with guide portions or walls beyond the teeth or cuttingportions, in the direction in which the pipe enters the head, that willserve to engage the pipe and center it so that its axis In theaccompanyin drawing showing one embodiment of niy invention Fig. 1 isawace view of die stock. a

2 is a cross section on the line 2-2 of Fig 1. i

Figs. 3 and l are views of the jaws or chaser-s detached. 40. 1

is Figs. 1 and 251 show a form of die stool;

in very imam use, that has means for represent in use, and also receivethe new torm of stock when the pipe or red is held l in a suitablemembersuch as a visefis applied to pipe. and then rigidly securedthereto inthe proper position. a-ndfa and nut portion. when theactuating; part is turned will cause the jaws to feed axially relativeto the pipe at the proper advance ceiving' the jaws whichc Applicationfiled. June 22, 1929 Serial No. 372,935. 7

corresponding with the thread that isforln'ed on the pipe. As shown inthe drawing the stock comprises an annular frame 6 provided with slots'1, 8, 9 and 10 in which slide the cutting jaws 11. This fra nehas athreaded extension sleeve 12 on which. turns a ring frame 13. This framehas rearwardly eX tending arins 1 1 with carrying sleeve 15. The lattercarries a loose collar 16 with. threaded holes 17, to receive screws 18,that pass through threaded holes 19 in the sleeve 15. i A set of fourrods 20, extend back from the ring frame 6 and carry ring 21 providedwith ratchet teeth 22 on its periphery. This ring 21 rides in a groove23 in the frame 13, An annular channel ring 2% rides on the edge ofthe.ring .21 and carries'e spring pawl 25 to engage the ratchet teeth andturn the ring it in one direction. Thisring is swung by a handle 26extending outwardly therefrom.

In the use of this device the pipe 27 is in sorted in the ring 16, andthe end to be threadedlis brought to engage the jaws ll. and the screws18 are set up to clamp the pipe in thering and hold it in this position.The pipe will have arather loose fitin the ring 16 when clamped by thescrews and its endwill not always aline with the jaws. The pipe beingclamped in a viseythe frame carrying the screw 18 and the nut member 13will also he held stationary. The ring 21 will be now swung by thehandle 26, that will also swing the frame 6 carrvingthe jawslli thatwill also turn the threaded sleeve 12. The latter 1 since the nut 13is'stationarvwill cause the frame 6 andthejaws tohave'a screw feed asturned, and this thread corresponds to the thread cut by the jaws andthe pipe. f Now it has been found that such a device where the jaws 11are simply the shank and cutter portions substantially square in section throughout the length, the pipewhen presented to the jaws andadvanced by the screw thread since it is atthis end portion not guidedby any means, tends to move out of the axis insteadof properly engagingand entering: the threaded ends of the jaws; and this is apparently thecase where the end of the pipe to be threaded is not cutsquare orperpendicular to its axis. l This will causeone side of the pipe toengage the jaw or two of the jaws, and the other jaws will not beengaged, so that the pipe will turn out of its axial position, and oneor more of the jaws will be pressed by the end of the pipe. If theturning and feeding continue, something must give away, and the jaws arelikely to break.

To overcome this objectionable condition I provide jaws as shown inFig.3 with a supporting face beyond the end having the cutting teeth, onthe side where the pipe enters, and which supporting faces are alllocated at the same distance from the axis of the head 6. and whichradial distance is slightly greater than the radius of the pipe or rodon which the thread is cut by the jaws. As

shown thejaws 11 are provided each with an extension projecting towardthe holding ring 6 for the pipe, and the innerface 31 of this extensionare each located. the/same distance ofthe axis of the holder 6, slightlygreater than the radius of the pipe. Each of these extensions is shownas having the outer portion of the face 31 inclined outward- 1 7 asshown at 32. these inclined. faces forming guides to center the pipe andenable it to move smoothly onto the supporting faces 31. Y

By the use of these jaws, when'the pipe 27 is passed through the holdingring 16, its end is passed between the extensions 30 until it reachesthe cutting end of the jaws. Then the screws18 are set up, and the pipewill obviously be held in this position. The pipe is then advanced byswinging the handle 26. and it must engage the thread faces of the jawsin a central position being held by the extensions 30 as advanced. and,a correct thread will. be formed. If the end. of the pipe is irregular.the thread will start on the extended portion, but the pipe cannot swingout of the true axialposition. 7

It will be understood that jaws of this character with the extensionscan be used with a single stock member without the look ing and feedingattachment.- because the ex tensions will guide the pipe into thecutting ends ofthe jaws, and cause a correct thread to be produced.

While I have described one embodiment of my invention. it can be alteredin form, arrangement relation and construction of parts, andmodification can be made within the 'perview of the invention and withinthe scope "of the claims. without departing from the spirit andimport ofthe invention.

What I claimis 1. The combination with a die stock having a bore for thereception of an article to be threaded of substantially greater diameterthan said article, said stock also having radial chaser receivingrecesses in its forward face and opening at their inner ends intofisaidbore, of a set of threading chasers having shanks fitting saidrecesses and secured therein, said chasers being provided with threadedends extending into said bore from said recesses and having extensionslongitudinally of the bore and positioned to engage the unthreadedportion of the article being threaded. said extensions having theirinner faces offset outwardly from the threaded portion to a slightdegree, said offset faces being of substantially the same lengths as thethreaded portions of the chasers and being parallel to the axis of thedie stock, and bevelled faces extending outwardly and rearwardly fromthe rear ends of the offset faces.

2. A threading jaw having a body and a shank projecting from one side,one end of said body having the face opposite the shank provided withthread chasing cutters, the other en. d of said body having a faceslightly offset towards the shank,.s aid offset portion being positionedto lie parallel to the axis of an article to be threaded so as tosupport the unthreaded portion of such article. the extremity of theoffset portion of said face being bevelled, to guide the article to bethreaded. onto said offset face portion.

S1gned at New York city, N. Y., on June LOUIS \V. JONES.

